Trainz

Trainz is a train simulator. It's perfect for a worldbuilder who likes running trains at 3 AM.

Routes

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Bidye Traction - The first of philskene's routes I would play with. It's short yet very very sweet. Lots of industries to spot some freight cars in with your little electric boxcab.

British Midlands - Typical 1970s British Rail scene. Typical motive power includes HSTs, Class 55s, and Class 37s. Introduced very early in the game's chronology.

City and Country USA - Typical Americana. Comes with a bunch of stations, a branch line to the mountains, and even a steel mill. Typical motive power includes F7s, SD40-2s, and shunters from ATSF, B&O, NYC, Southern, and CB&Q. Introduced very early in the game's chronology.

Kickstarter County - I assume this was named in honour of those who donated on Kickstarter. There's a circular mainline with a branch up a mountain. It could even form its own little economy.

Mojave Subdivision - If you like zipping across the desert with hundreds of containers and trailers at 70 MPH, then this is for you.

NEC Wilmington-Philadelphia - They even got Acela trains at one point. Good for them. Also somehow there aren't any Silverliners. Maybe SEPTA didn't like it...

Outback Australia - Made with two baseboards, this route has equipment from New South Wales, Queensland, and South Australia (I think). Introduced very early in the game's chronology.

Hypothetical

Technically anything. But like, Trainz take up soooo much space these days, not to mention all the DLC.